diff --git a/src/emu/inptport.c b/src/emu/inptport.c
index 269147fe077..799373c9742 100644
--- a/src/emu/inptport.c
+++ b/src/emu/inptport.c
@@ -628,7 +628,7 @@ INLINE const char *get_port_tag(const input_port_config *port, char *tempbuffer)
     buffer
 -------------------------------------------------*/
 
-INLINE void *error_buf_append(char *errorbuf, int errorbuflen, const char *format, ...)
+INLINE void* ATTR_PRINTF(3,4) error_buf_append(char *errorbuf, int errorbuflen, const char *format, ...)
 {
 	int curlen = (errorbuf != NULL) ? strlen(errorbuf) : 0;
 	int bytesleft = errorbuflen - curlen;
diff --git a/src/emu/sound/rf5c68.c b/src/emu/sound/rf5c68.c
index a5c6023167a..cc136017a83 100644
--- a/src/emu/sound/rf5c68.c
+++ b/src/emu/sound/rf5c68.c
@@ -126,7 +126,6 @@ static SND_START( rf5c68 )
 	/* allocate memory for the chip */
 	struct rf5c68pcm *chip = auto_malloc(sizeof(*chip));
 	memset(chip, 0, sizeof(*chip));
-	memset(chip->data, 0xff, sizeof(chip->data));
 
 	/* allocate the stream */
 	chip->stream = stream_create(device, 0, 2, clock / 384, chip, rf5c68_update);